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Please use this identifier to cite or link to this item: http://hdl.handle.net/2122/3916

Authors: Consolini, G.*
De Michelis, P.*
Meloni, A.*
Title: Fluid motions in the Earth’s core inferred from time spectral features of the geomagnetic field
Title of journal: Physical Review E
Series/Report no.: 3 / 65 (2002)
Publisher: The American Physical Society
Issue Date: 2002
DOI: 10.1103/PhysRevE.65.037303
Keywords: Geomagnetism
Secular variation
Earth's core
Abstract: The aim of this work is to investigate the time spectral features of the main geomagnetic field fluctuations as measured on the Earth’s surface in connection with a nontraditional turbulent dynamics of the fluid motions in the outer layers of the Earth’s liquid core. The average geomagnetic field spectrum is found to be a power law, characterized by a spectral exponent α≈−11/3, on time scales longer than 5 yr. We discuss the spectral exponent in connection with an intense magnetic field in the Earth’s core and with a vortex coalescence process in a regime of drift-wave turbulence.
Appears in Collections:Papers Published / Papers in press
04.05.01. Dynamo theory
04.01.03. Mantle and Core dynamics
04.05.05. Main geomagnetic field

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